6533b7d2fe1ef96bd125e93c
RESEARCH PRODUCT
Die bestimmung der molekulargewichtsverteilung von nichtkristallisierenden polymeren mit dem elektronenmikroskop, 7. Präparation durch verdampfung des lösungsmittels aus lösung
G. KoszterszitzG. V. Schulzsubject
chemistry.chemical_classificationEvaporationPolymerPreparation methodchemistry.chemical_compoundchemistryNatural rubbervisual_artPolymer chemistryvisual_art.visual_art_mediumMoleculeMolar mass distributionMethyl methacrylateElectron microscopicdescription
A preparation method is described by means of which it is possible to transfer individual molecules of a high molecular weight polymer on a support, in order to determine their mass and therefrom their molecular weight distribution, using our previously published electron microscopic method. The advantages of the new procedure as compared to the previously described freeze-drying are 1 that the range of solvents, which can be used is much larger, and 2 that the preparation is performed by evaporation from a dilute solution, which means that the molecules are distributed statistically on the support. The risk of formation of associates is avoided by keeping the polymer concentration correspondingly low and the rate of evaporation high. As examples the results for three samples of poly(methyl methacrylate) and one sample of natural rubber are reported and discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1977-08-01 | Die Makromolekulare Chemie |